There is no option for it…
I’ve matchmaked 3 times, and every time there is this one guy just AFKs from the start. I want to report the guy, but there isn’t even an option for it…
Report them through their online ticket system, usually they’ll -try- to do something about players like this but I’d assume since it’s still griefing in a way, their support system should do something about it. Sucks to be stuck with that one guy who just wants free loot though.